Table S2.

Multiple regression for the linear global time effect (from pretest to 6-month test, N=71) and the interaction between orthogonal contrasts and time effect for gait variable “step length”

Dependent variable	Predictor	b	95% CI		SE b	β	P two tailed	R2-change
Step length preferred	Linear global time effect	1.71	1.12	2.30	0.30	0.15	<0.001***	0.022
	Quadratic global time effect	−0.31	−0.65	0.03	0.17	−0.05	0.072t	0.002
	Linear interaction AB × C	−0.12	−0.54	0.29	0.21	−0.02	0.551	0.000
	Linear interaction A × B	−0.54	−1.27	0.19	0.37	−0.04	0.147	0.001
Step length fast	Linear global time effect	1.55	0.97	2.13	0.30	0.11	<0.001***	0.012
	Quadratic global time effect	−0.16	−0.50	0.18	0.17	−0.02	0.352	0.000
	Linear interaction AB × C	−0.19	−0.60	0.21	0.21	−0.02	0.346	0.000
	Linear interaction A × B	−0.19	−0.92	0.53	0.37	−0.01	0.600	0.000
Step length preferred DT	Linear global time effect	1.98	1.37	2.60	0.31	0.15	<0.001***	0.024
	Quadratic global time effect	−0.02	−0.37	0.34	0.18	0.00	0.920	0.000
	Linear interaction AB × C	−0.34	−0.77	0.09	0.22	−0.04	0.119	0.001
	Linear interaction A × B	−0.49	−1.25	0.28	0.39	−0.03	0.209	0.001
Step length fast DT	Linear global time effect	1.69	1.06	2.33	0.32	0.13	<0.001***	0.016
	Quadratic global time effect	0.16	−0.21	0.52	0.19	0.02	0.400	0.000
	Linear interaction AB × C	−0.33	−0.78	0.11	0.22	−0.04	0.136	0.001
	Linear interaction A × B	−0.03	−0.81	0.76	0.40	0.00	0.947	0.000
Step length preferred DTC	Linear global time effect	0.00	−0.01	0.01	0.01	0.04	0.482	0.001
	Quadratic global time effect	0.00	0.00	0.01	0.00	0.08	0.127	0.006
	Linear interaction AB × C	0.00	−0.01	0.00	0.00	−0.06	0.293	0.003
	Linear interaction A × B	0.00	−0.01	0.01	0.01	−0.01	0.858	0.000
Step length fast DTC	Linear global time effect	0.00	−0.01	0.01	0.00	0.03	0.494	0.001
	Quadratic global time effect	0.01	0.00	0.01	0.00	0.09	0.049*	0.009
	Linear interaction AB × C	0.00	−0.01	0.00	0.00	−0.05	0.264	0.003
	Linear interaction A × B	0.00	−0.01	0.01	0.01	0.00	0.983	0.000

Notes: Bold values indicate significance or trend.

^*P<0.05.

^***P<0.001.

^tP<0.10 trend.

Abbreviations: A, DANCE; B, MEMORY; C, PHYS; CI, confidence interval; DANCE, virtual reality video game dancing; DT, dual-task; DTC, dual-task cost; MEMORY, treadmill walking with simultaneous verbal memory training; PHYS, treadmill walking; SE, ± standard error.